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    SubjectRe: [PATCH 0/4] iommu: iommu_ops group interface
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    On Fri, 2011-10-21 at 13:55 -0600, Alex Williamson wrote:
    > IOMMUs can't always distiguish transactions from each individual
    > device in a system. Sometimes this is by design (such as powerpc
    > partitionable endpoints), other times by topology (PCIe-to-PCI
    > bridges masking downstream devices). We call these sets of
    > indistinguishable devices "groups".
    >
    > In order to support secure userspace drivers, like vfio, we need
    > an interface to expose the device-to-group relationship. This
    > allows us to create policies ensuring that userspace controls all
    > of the devices in the group before allowing individual device
    > access.
    >
    > This series implements the iommu_ops API interface and sysfs
    > interface for exposing groups to userspace. This also includes
    > the intel-iommu and amd-iommu backend implementations. It's
    > intended that the vfio driver will make use of these interfaces
    > to support generic device assignment for virtual machines. See
    > git://github.com/awilliam/linux-vfio.git (vfio-ng) for a working
    > example using this interface.
    >
    > Patches based on Joerg's next branch to support per-bus iommu_ops.
    >
    > Note the amd-iommu is untested, I'm still working on setting up
    > an AMD-Vi capable system. Thanks,

    Now tested, even seems to work :)

    Alex

    > ---
    >
    > Alex Williamson (4):
    > iommu: Add option to group multi-function devices
    > amd-iommu: Implement iommu_device_group
    > intel-iommu: Implement iommu_device_group
    > iommu: Add iommu_device_group callback and iommu_group sysfs entry
    >
    >
    > Documentation/kernel-parameters.txt | 4 ++
    > arch/ia64/include/asm/iommu.h | 2 +
    > arch/ia64/kernel/pci-dma.c | 1 +
    > arch/x86/include/asm/iommu.h | 1 +
    > arch/x86/kernel/pci-dma.c | 11 ++++++
    > drivers/iommu/amd_iommu.c | 21 ++++++++++++
    > drivers/iommu/intel-iommu.c | 47 +++++++++++++++++++++++++++
    > drivers/iommu/iommu.c | 61 +++++++++++++++++++++++++++++++++++
    > include/linux/iommu.h | 7 ++++
    > 9 files changed, 154 insertions(+), 1 deletions(-)





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